"Iain Miller" wrote in message
...
peat bags in the filter will make your water a bit more acidic however
as
soon as the peat is exhausted then the PH will climb back up.

It will only climb back up as a result of water changes with harder water.
Treating water with peat (in or out of the tank) basically drops the Kh.
A
lower Kh gives a lower Ph at a constant level of CO2 i.e. it basically
removes the buffer from the water and its a permanent change.
snip

well then I guess don't do water changes and maintain the same PH and KH. So
let me clarify , when the peat becomes exhausted AND you do a water changes
using tap water which I assume is harder water or why would you be using
peat, your PH and KH will rise and unless you are testing constantly you
will not know when this is occurring.

Rick